docs: def _encrypt_data_key(
          self, data_key: DataKey, algorithm: AlgorithmSuite, encryption_context: Dict[Text, Text]
      ) -> NoReturn:
          """Encrypt a data key and return the ciphertext.
  
          :param data_key: Unencrypted data key
          :type data_key: :class:`aws_encryption_sdk.structures.RawDataKey`
              or :class:`aws_encryption_sdk.structures.DataKey`
          :param algorithm: Algorithm object which directs how this Master Key will encrypt the data key
          :type algorithm: aws_encryption_sdk.identifiers.Algorithm
          :param dict encryption_context: Encryption context to use in encryption
          :raises NotImplementedError: when called
          """
          raise NotImplementedError("CountingMasterKey does not support encrypt_data_key")